On a K-5, by the Ephotozine:-
http://www.ephotozine.com/article/smc-pentax-da-55-300mm-f-4-5-8-ed-lens-review-16547
I think this one generally agrees with the previous lens test by the Photozone, which can be found here:-
http://www.photozone.de/pentax/396-pentax_55300_458
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